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Why open-source DNS is 'internet's dirty little secret'

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"Are you talking about open-source software?
Correct. So, whether it's Eircom in Ireland or a Brazilian ISP that
was attacked earlier this year, all of them were using some variant
of freeware. Freeware is not akin to malware, but is opening up
those customers to problems. So we've seen the majority of the
world's top ISPs migrating away from freeware to a solution that is
carrier-grade, commercial-grade and secure.

"What characterises that open-source, freeware legacy DNS that
you think makes it weaker? Number one is in terms of security
controls. If I have a secret way of blocking a hacker from
attacking my software, if it's freeware or open source, the hacker
can look at the code.

"By virtue of something being open source, it has to be open to
everybody to look into. I can't keep secrets in there. But if I
have a commercial-grade software product, then all of that is
closed off, and so things are not visible to the hacker."